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lkdtm: Fix Oops when unloading the module 

No jprobe is registered when the module is loaded without specifying a
crashpoint that uses a jprobe. At the moment, we unconditionally try to
unregister the jprobe on module unload which results in an Oops. Add a
check to fix this.

Signed-off-by: Juerg Haefliger <juerg.haefliger@hpe.com>
Acked-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Juerg Haefliger 2017-01-19 11:40:13 +01:00 committed by Greg Kroah-Hartman
parent 8ade6039b8
commit 9ba6057363
1 changed files with 3 additions and 1 deletions
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4
drivers/misc/lkdtm_core.c
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@ -535,7 +535,9 @@ static void __exit lkdtm_module_exit(void)
/* Handle test-specific clean-up. */
lkdtm_usercopy_exit();
unregister_jprobe(lkdtm_jprobe);
if (lkdtm_jprobe != NULL)
unregister_jprobe(lkdtm_jprobe);
pr_info("Crash point unregistered\n");
}